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datum plane

noun
1.
(surveying) the horizontal plane from which heights and depths are calculated
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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datum plane in Medicine

datum plane da·tum plane (dā'təm, dāt'əm, dä'təm)
n.
An arbitrary plane used as a base from which to make craniometric measurements.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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